1 files changed, 39 insertions, 0 deletions
diff --git a/code/esp32/components/eos/msgq.c b/code/esp32/components/eos/msgq.c
new file mode 100644
index 0000000..ec89efe
--- /dev/null
+++ b/code/esp32/components/eos/msgq.c
@@ -0,0 +1,39 @@
+#include <stddef.h>
+#include <string.h>
+
+#include "eos.h"
+#include "msgq.h"
+
+#define EOS_MSGQ_IDX_MASK(IDX, SIZE)  ((IDX) & ((SIZE) - 1))
+
+void eos_msgq_init(EOSMsgQ *msgq, EOSMsgItem *array, uint8_t size) {
+    msgq->idx_r = 0;
+    msgq->idx_w = 0;
+    msgq->array = array;
+    msgq->size = size;
+}
+
+int eos_msgq_push(EOSMsgQ *msgq, unsigned char cmd, unsigned char *buffer, uint16_t len) {
+    if (msgq->idx_w - msgq->idx_r == msgq->size) return EOS_ERR_Q_FULL;
+
+    uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_w, msgq->size);
+    msgq->array[idx].cmd = cmd;
+    memcpy(msgq->array[idx].buffer, buffer, len);
+    msgq->array[idx].len = len;
+    msgq->idx_w++;
+    return EOS_OK;
+}
+
+void eos_msgq_pop(EOSMsgQ *msgq, unsigned char *cmd, unsigned char **buffer, uint16_t *len) {
+    if (msgq->idx_r == msgq->idx_w) {
+        *cmd = 0;
+        *buffer = NULL;
+    } else {
+        uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_r, msgq->size);
+        *cmd = msgq->array[idx].cmd;
+        *buffer = msgq->array[idx].buffer;
+        *len = msgq->array[idx].len;
+        msgq->idx_r++;
+    }
+}
+